<div *ngIf="show">
    <input type="text" #title>
    <br>
    <input type="text" #universe>
    <br>
    <textarea rows="3" cols="20" #context>
        文章内容
    </textarea>
    <br>
    <button (click)="upload(title.value, universe.value, context.value)">
            upload
    </button>
</div>